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mal/impls/lib/load-file-once.mal
Joel Martin 8a19f60386 Move implementations into impls/ dir
- Reorder README to have implementation list after "learning tool"
  bullet.

- This also moves tests/ and libs/ into impls. It would be preferrable
  to have these directories at the top level.  However, this causes
  difficulties with the wasm implementations which need pre-open
  directories and have trouble with paths starting with "../../". So
  in lieu of that, symlink those directories to the top-level.

- Move the run_argv_test.sh script into the tests directory for
  general hygiene.
2020-02-10 23:50:16 -06:00

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;; Like load-file, but will never load the same path twice.
;; This file is normally loaded with `load-file`, so it needs a
;; different mechanism to neutralize multiple inclusions of
;; itself. Moreover, the file list should never be reset.
(def! load-file-once
(try*
load-file-once
(catch* _
(let* [seen (atom {"../lib/load-file-once.mal" nil})]
(fn* [filename]
(if (not (contains? @seen filename))
(do
(swap! seen assoc filename nil)
(load-file filename))))))))